Keyboard control in Virtualbox GUI

Description

Hello,

I found the whole GUI of Virtualbox can be nicely controlled only with a keyboard, but there is one area (button) where I am forced to use a mouse, which is discomfortable.

The button is actually in the Virtual Media Manager module, it´s function is "browse" button. I am providing screenshots for better idea. I tested this on several machines with different versions of Windows and VirtualBox. The button is not accessible via standard Windows GUI keyboard shortcuts. If I jump with the TAB key from the text field for the HDD name, I assume that I am on that "browse" button, but if I hit ENTER to push it, the dialog is going to another page. But if I jump from the text field 2 times, I can perfectly adjust the size of HDD in the slider element.

I found the button on two places in VirtualBox GUI (in none of them is accessible via keyboard)